Almost 20 million children missed out on potentially life-saving vaccinations last year, the United Nations (UN) said Monday, as surging measles cases highlighted "dangerous" gaps in efforts to shield kids from preventable illness.Last year, 19.4 million children were "not fully vaccinated", the World Health Organization (WHO) and the UNICEF children's agency said in an annual report – up from 18.7 million in 2017 and about 18.5 million the year before.This all pointe